engine.c

mediastreamer2是开源的网络传输媒体流的库

/* apps/engine.c -*- mode: C; c-file-style: "eay" -*- */
/* Written by Richard Levitte <[e-mail]> for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */

#ifndef OPENSSL_NO_ENGINE

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef OPENSSL_NO_STDIO
#define APPS_WIN16
#endif
#include "apps.h"
#include <openssl/err.h>
#include <openssl/engine.h>
#include <openssl/ssl.h>

#undef PROG
#define PROG	engine_main

static const char *engine_usage[]={
"usage: engine opts [engine ...]\n",
" -v[v[v[v]]] - verbose mode, for each engine, list its 'control commands'\n",
"               -vv will additionally display each command's description\n",
"               -vvv will also add the input flags for each command\n",
"               -vvvv will also show internal input flags\n",
" -c          - for each engine, also list the capabilities\n",
" -t[t]       - for each engine, check that they are really available\n",
"               -tt will display error trace for unavailable engines\n",
" -pre <cmd>  - runs command 'cmd' against the ENGINE before any attempts\n",
"               to load it (if -t is used)\n",
" -post <cmd> - runs command 'cmd' against the ENGINE after loading it\n",
"               (only used if -t is also provided)\n",
" NB: -pre and -post will be applied to all ENGINEs supplied on the command\n",
" line, or all supported ENGINEs if none are specified.\n",
" Eg. '-pre \"SO_PATH:/lib/libdriver.so\"' calls command \"SO_PATH\" with\n",
" argument \"/lib/libdriver.so\".\n",
NULL
};

static void identity(void *ptr)
	{
	return;
	}

static int append_buf(char **buf, const char *s, int *size, int step)
	{
	int l = strlen(s);

	if (*buf == NULL)
		{
		*size = step;
		*buf = OPENSSL_malloc(*size);
		if (*buf == NULL)
			return 0;
		**buf = '\0';
		}

	if (**buf != '\0')
		l += 2;		/* ", " */

	if (strlen(*buf) + strlen(s) >= (unsigned int)*size)
		{
		*size += step;
		*buf = OPENSSL_realloc(*buf, *size);
		}

	if (*buf == NULL)
		return 0;

	if (**buf != '\0')
		BUF_strlcat(*buf, ", ", *size);
	BUF_strlcat(*buf, s, *size);

	return 1;
	}

static int util_flags(BIO *bio_out, unsigned int flags, const char *indent)
	{
	int started = 0, err = 0;
	/* Indent before displaying input flags */
	BIO_printf(bio_out, "%s%s(input flags): ", indent, indent);
	if(flags == 0)
		{
		BIO_printf(bio_out, "<no flags>\n");
		return 1;
		}
        /* If the object is internal, mark it in a way that shows instead of
         * having it part of all the other flags, even if it really is. */
	if(flags & ENGINE_CMD_FLAG_INTERNAL)
		{
		BIO_printf(bio_out, "[Internal] ");
		}

	if(flags & ENGINE_CMD_FLAG_NUMERIC)
		{
		if(started)
			{
			BIO_printf(bio_out, "|");
			err = 1;
			}
		BIO_printf(bio_out, "NUMERIC");
		started = 1;
		}
	/* Now we check that no combinations of the mutually exclusive NUMERIC,
	 * STRING, and NO_INPUT flags have been used. Future flags that can be
	 * OR'd together with these would need to added after these to preserve
	 * the testing logic. */
	if(flags & ENGINE_CMD_FLAG_STRING)
		{
		if(started)
			{
			BIO_printf(bio_out, "|");
			err = 1;
			}
		BIO_printf(bio_out, "STRING");
		started = 1;
		}
	if(flags & ENGINE_CMD_FLAG_NO_INPUT)
		{
		if(started)
			{
			BIO_printf(bio_out, "|");
			err = 1;
			}
		BIO_printf(bio_out, "NO_INPUT");
		started = 1;
		}
	/* Check for unknown flags */
	flags = flags & ~ENGINE_CMD_FLAG_NUMERIC &
			~ENGINE_CMD_FLAG_STRING &
			~ENGINE_CMD_FLAG_NO_INPUT &
			~ENGINE_CMD_FLAG_INTERNAL;
	if(flags)
		{
		if(started) BIO_printf(bio_out, "|");
		BIO_printf(bio_out, "<0x%04X>", flags);
		}
	if(err)
		BIO_printf(bio_out, "  <illegal flags!>");
	BIO_printf(bio_out, "\n");
	return 1;
	}

static int util_verbose(ENGINE *e, int verbose, BIO *bio_out, const char *indent)
	{
	static const int line_wrap = 78;
	int num;
	int ret = 0;
	char *name = NULL;
	char *desc = NULL;
	int flags;
	int xpos = 0;
	STACK *cmds = NULL;
	if(!ENGINE_ctrl(e, ENGINE_CTRL_HAS_CTRL_FUNCTION, 0, NULL, NULL) ||
			((num = ENGINE_ctrl(e, ENGINE_CTRL_GET_FIRST_CMD_TYPE,
					0, NULL, NULL)) <= 0))
		{
#if 0
		BIO_printf(bio_out, "%s<no control commands>\n", indent);
#endif
		return 1;
		}

	cmds = sk_new_null();

	if(!cmds)
		goto err;
	do {
		int len;
		/* Get the command input flags */
		if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num,
					NULL, NULL)) < 0)
			goto err;
                if (!(flags & ENGINE_CMD_FLAG_INTERNAL) || verbose >= 4)
                        {
                        /* Get the command name */
                        if((len = ENGINE_ctrl(e, ENGINE_CTRL_GET_NAME_LEN_FROM_CMD, num,
                                NULL, NULL)) <= 0)
                                goto err;
                        if((name = OPENSSL_malloc(len + 1)) == NULL)
                                goto err;
                        if(ENGINE_ctrl(e, ENGINE_CTRL_GET_NAME_FROM_CMD, num, name,
                                NULL) <= 0)
                                goto err;
                        /* Get the command description */
                        if((len = ENGINE_ctrl(e, ENGINE_CTRL_GET_DESC_LEN_FROM_CMD, num,
                                NULL, NULL)) < 0)
                                goto err;
                        if(len > 0)
                                {
                                if((desc = OPENSSL_malloc(len + 1)) == NULL)
                                        goto err;
                                if(ENGINE_ctrl(e, ENGINE_CTRL_GET_DESC_FROM_CMD, num, desc,
                                        NULL) <= 0)
                                        goto err;
                                }
                        /* Now decide on the output */
                        if(xpos == 0)
                                /* Do an indent */
                                xpos = BIO_printf(bio_out, indent);
                        else
                                /* Otherwise prepend a ", " */
                                xpos += BIO_printf(bio_out, ", ");
                        if(verbose == 1)
                                {
                                /* We're just listing names, comma-delimited */
                                if((xpos > (int)strlen(indent)) &&
					(xpos + (int)strlen(name) > line_wrap))
                                        {
                                        BIO_printf(bio_out, "\n");
                                        xpos = BIO_printf(bio_out, indent);
                                        }
                                xpos += BIO_printf(bio_out, "%s", name);
                                }
                        else
                                {
                                /* We're listing names plus descriptions */